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Home >> Saturn >> 2007 >> Relay 3.9 W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0010 To DTC P0420 >> DTC P0016 >> Circuit/System Verification
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Circuit/System Verification

    IMPORTANT: The supply of clean pressurized engine oil to the CMP actuator is essential to CMP actuator performance.
  1. Observe the engine oil level. The engine oil level should be within operating range. Refer to Approximate Fluid Capacities .
  2. Ensure that the vehicle has the correct engine oil and is not old, burnt or contains additives. Refer to Checking Things Under the Hood in Service and Appearance Care within the Owner's Manual.
    • If the vehicle has the incorrect engine oil, is old, burnt, or contains additives then change the oil and filter.
  3. Test the engine oil pressure for correct operation. Refer to Oil Pressure Diagnosis and Testing .
  4. Allow the engine to reach operating temperature.
  5. Set the parking brake and place the vehicle in park for automatic, or neutral for manual.
  6. Observe the CMP variance parameter. The CMP Variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP Variance should again return to 0 degrees.
    7. IMPORTANT: The engine will run rough and may require throttle input to keep running.
  7. Command the CMP actuator to 24 degrees. The Desired CMP parameter should match the CMP Angle parameter.
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